An experimental study on the physico-mechanical properties of two post-high-temperature rocks

Shi, Lei; Xu, Jinyu

doi:10.1016/j.enggeo.2014.11.013

Cited by 270 publications

(63 citation statements)

References 28 publications

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“…e stress-strain curves show similar shape in general and can be divided into four stages of compaction, elasticity, yield, and failure; this result is the same as that of most of the researches [1][2][3][4][5][6][7].…”

Section: Mechanical Propertiessupporting

confidence: 65%

“…e characteristics of rock strength and deformation will be affected by high temperature [1][2][3][4][5][6][7][8][9]. Many rock engineerings, such as nuclear waste disposal [10], geothermal resource development [11,12], underground engineering stability [13], postdisaster reconstruction [14,15], and other projects, are inevitably related to high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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Acoustic emission (AE) signals can be detected from rocks under the effect of temperature and loading, which can be used to reflect rock damage evolution process and predict rock fracture. In this paper, uniaxial compression tests of granite at high temperatures from 25°C to 1000°C were carried out, and AE signals were monitored simultaneously. e results indicated that AE ring count rate shows the law of "interval burst" and "relatively calm," which can be explained from the energy point of view. From 25°C to 1000°C, the rock failure mode changes from single splitting failure to multisplitting failure, and then to incomplete shear failure, ideal shear failure, and double shear failure, until complete integral failure. ermal damage (D T ) defined by the elastic modulus shows logistic increase with the rise of temperature. Mechanical damage (D M ) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

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Section: Mechanical Propertiessupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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“…that, it drops obviously. Because of deformation changes in structure lead to expansion and fine surface grains on the samples may flack under temperature deformation [8]. Figure 3 shows the evolution curve between porosity of sandstone samples and temperature.…”

Section: Variation In Ultrasonic P-wave Velocitymentioning

confidence: 99%

“…Zhang et al [6] measured the dynamic fracture toughness of Fangshan gabbro and Fangshan marble subjected to high temperature by split Hopkinson pressure bar (SHPB) system. Liu and Xu [7,8] carried out the dynamic mechanical experiments on marble under different temperature and different strain rates by using the high temperature split Hopkinson pressure bar (SHPB) experimental system. There are linear relationships among peak stress, peak strain, and elastic modulus with the temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Zhang

Jing

2018

Shock and Vibration

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Thermal damage and energy evolution characteristics in process of impact failure of sandstone after high temperature treatment were studied by split Hopkinson pressure bar (SHPB) system. The ultrasonic P-wave velocity, density, porosity, peak stress, / 0 , thermal damage, fracture, and energy evolution characteristics of sandstone with temperature during the experimental process were explored. Results show that, with the increase of temperature, the ultrasonic P-wave velocity and density decrease, while the porosity increases. It is found that the peak stress and / 0 decrease with the increase of temperature, and the decreasing trend is fitted with the simple cubic equation. Above 600 ∘ C, dynamic peak stress and / 0 decrease rapidly. The thermal damage of rock increases with the increase of temperature, which is in accordance with the logistic curve model. The thresholds of damage strain energy release rate are 200 ∘ C and 800 ∘ C in this research. Its total input strain energy decreases with the increase of processing temperature and decreases sharply when the temperature is over 600 ∘ C. The variation of total input strain energy has small change at the range from 400 ∘ C to 600 ∘ C.

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“…Vishal et al investigated the static splitting strength of granite at the temperatures from 30°C to 250°C, and indicated that the splitting strength increased slightly for temperatures below 100°C and began to decrease for higher temperatures [9]. Liu et al reported that the dynamic splitting tensile strength of marble was greatly affected by temperature based on the split Hopkinson pressure bar (SHPB) tests on heat-treated specimens [10]. As for the dynamic tensile strength of rock, Huang et al concluded that the saturated specimen had stronger rate sensitivity than the dry specimen, and the water softening factor decreased with the loading rate [11].…”

Section: Introductionmentioning

confidence: 96%

Effect of Heat Treatment on Dynamic Tensile Strength and Damage Behavior of Medium-Fine-Grained Huashan Granite

Wang

Shi

2017

Exp Tech

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In order to investigate the dynamic behavior of medium-fine-grained Huashan granite treated by different temperatures, the splitting tests on the granite specimens are carried out using an improved split Hopkinson pressure bar (SHPB). The dynamic force equilibrium condition in the specimen is basically satisfied. The results show that with increasing treatment temperature, the ultrasonic P-wave velocity decreases, while thermal damage accordingly increases. The damage evolution follows the logistic curve model. For a temperature at or below 500°C, all the specimens break diametrically into two halves at relatively low impact velocities. As the impact velocity rises, the triangular crushed zones are observed at the two loading ends of the specimen. When the temperature exceeds 500°C, the damage of the specimen becomes severe, and even completely pulverized under high impact velocity. There are good correlations between the splitting strength and the treatment temperature, the ultrasonic P-wave velocity as well as the thermal damage. In addition, the splitting strength is slightly abnormal at 100°C, namely the strength becomes lower than that at room temperature with increasing impact velocity. Overall, the decay of the splitting strength with thermal damage for the treatment temperatures over 100°C accords with the power function. Moreover, the splitting strength of specimen is sensitive to strain rate at high temperature, but the increasing rates are different under different ranges of temperature.

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An experimental study on the physico-mechanical properties of two post-high-temperature rocks

Cited by 270 publications

References 28 publications

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Effect of Heat Treatment on Dynamic Tensile Strength and Damage Behavior of Medium-Fine-Grained Huashan Granite

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